Apparatus for starting electric elevators



No. 623,!4I. Patented Apr. l8, I899,

u. u. DARBIN. v APPARATUS FOR STARTING ELECTRIC ELEVATORS. (Applicltion am Aug. 1, 1598.

(No Model.) q 1 2 wi/lnmoeo 6 gwwwlioz THE Nonms PETERS o0. PnoTo-uwm, WASHINGTON, u c,

llwrren STATES PATENT OFFICE,

DAVIDII. DARRIN, OF CRANFORD, NEWV JERSEY.

APPARATUS FOR STARTING ELECTRIC'ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 623,141, dated April 18, 1899.

Application filed August 1,1898. Serial No. 687,406. (No model.)

To all whont it may concern-.-

. Be it known that 1, DAVID H. DARRIN, a citizen of the United States, residing at Cranford, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Apparatus for Starting Electric Elevators, of which the following is a full, clear, and exact specification.

My invention relates to elevator-hoisting apparatus; and its object is to prevent the settling of the'car at start caused by failure of belts to shift immediately and take hold on the tight pulley when the load of the car is put upon the motor and the brake of the winding-machine is released.

A further object is to provide means for automatically cuttin g oft current from the motor when the elevator is not in use, and thus preventing the loss or waste of current by careless or indifferent operators.

In such apparatus at presentin practical use itis customary for the carafterthe operatorhas pulled the starting-rope to settle for a moment until the belt has shifted to the tight pulley and has obtained a firm hold thereon, and in some cases where provision has been made for starting the motor in advance of the car the circuit which allows the motor to be thus started will remain closed until opened by some positive act of the operator, and it the operators attention be diverted by other matters or he be careless orindiiferent the motor will continue running after the elevator has stopped.

According to my invention I propose to provide an auxiliary switch controllinga circuit leading to the motor to start the latter, means operated from the car for controlling the switch, means whereby the switch will normally remain open, and a main switch automatically opened and closed by the beltshifting mechanism simultaneously with the shifting of the belt and the releasing or setting of the brake.

The invention will be more particularly described with reference to the accompanying drawing, in which the figure represents diagrammatically an elevator apparatus constructed in accordance with my invention.

1 represents the motor, which is belted in the usual manner to the pulleys 2, 3, and at of the winding apparatus by a belt 5, the belt positive and negative.

being shifted by a belt-shifter 6 to raise or lower the car.

7 is the sheave around which the startingrope 8,which extends through the shaft,passes, and 9 is the brake, operated in the usual mannor by the turning of sheave 7. The beltshifter 6 is also operated by the turning of the sheave. A pinion 10, mounted on the shaft of sheave 7, engages a rack 11 on a bar 12, connected to the operating-bar of the doublethrow switch 13, which controls the flow of the current from the supply-circuit to the motor.

14 is a rheostat through which current from the motor flows to properly start the latter.

The various parts thus far described are all common in theart, and numerous designs and constructions of such apparatus are well known.

Any suitable devices may be used in the construction of the parts of my invention, and I have therefore illustrated the various parts conventionally in the drawing.

The switch 13 may be provided with an operating-lever 15, to which rod 12 is connected, and the length of the rod and lever preferably so adjusted that the contact-blade 16 and jaws 17 of the switch will make contact with each other simultaneously wit-h the shifting of the belt and release of the brake.

A switch 18, to the operating-lever of which is attached a weight 19, adapted to normally hold the switch open, controls the supply-circuit connected with the motor to start and run the motor to hoist the car. In place of the weight 19 any suitable means may be employed to hold the switch in open position except when held closed by the operator.

An auxiliary rope 20, which when pulled closes switch 18 and when released allows the latter to open, passes up and down the shaft. The circuits may of course be arranged in any suitable manner. In the drawing the terminals 21 and 22 are respectively and leads by way of wire 23 to the positive side of switch 13 and by way of wire 33 to the positive side of switch 18 From the negative terminal 22 a wire 27 splits and leads to the negative side of switch 13 and by way A wire from 21 splits ICC of wire 36 to the negative side of switch 18.

The two positive contacts of switch 13 are joined, and from thence a wire 24: leads to the field of the motor. From the positive side of switch 18 a wire 34 leads to wire 2%, and from wire 24 a wire 30 leads to the rheostat lat, and from the latter the wire 31 leads to armature of the motor, joining the brush of the latter at terminal 1. The outer negative contacts of switch 13 are joined to the negative contact of switch 18 by a wire 35, and the latter wire is connected by a wire 26 with the field of the motor and also with the armature of the motor by wire The inner contacts of the switches 13 and 18 are joined by a wire 28, the latter leading to the solenoid 29 of the rheostat 14, the wire 29 being connected with the first coil of the resistance, whereby the solenoid will be energized from the positive side of the line.

In the operation of the device above described, the car being at rest and the switches consequently open, the operator pulls the auxiliary rope 20, which closes the circuit through the motor and starts the latter. After the motor has run for a moment without load the operator may release the rope, when the auxiliary switch will automatically open, and thus prevent further consumption of current from this metallic circuit. He then pulls the starting-rope, which shifts the belt, releases the brake, and closes the main switch to allow the current to flow into the motor, which owing to its momentum is still in motion. By reason of the momentum of the motor the belts will shift as readily as if the motor were in constant motion. There will therefore be no opportunity for the car to settle during the time of shifting the belts. When the car is stopped, which is done by pulling the starting-rope in the direction to open the main switch, shift the belt, and apply the brake, the main metallic circuit will be opened and no current can be consu med therein. It will therefore be seen that no matter how careless or indifferent the operator may be there will be no circuit closed in which the current could be consumed while the car is not being operated.

Having thus described my invention, I declare that what I claim is 1. The combination with an elevator and its hoisting apparatus, of a motor, an auxiliary circuit connected with said motor, an auxiliary switch controlling said circuit, means for operating said switch from the car, a working circuittconnected with the motor, a main switch controlling the same, and means, operated from the car, for simultaneously shifting the belt of the motor to the tight pulley of the apparatus, releasing the brake, and closing said main switch, substantially as described.

2. The combination with an elevator and its hoisting apparatus, of a motor, an auxiliary circuit connected with said motor, an auxiliary switch controlling said circuit, means for operating said switch from the car, means for normally holding said switch in open position, a working circuit connected with the motor, a main switch controlling the same, and means, operated from the car, for simultaneously shifting the belt of the motor to the tight pulley of the apparatus, releasing the brake, and closing said main switch, substantially as described. I

3. The combination with an elevator and its hoisting apparatus, of a motor, a normally open auxiliary circuit connected with the motor, means, operated from the car, for closing the same, a main working circuit connected with said motor, and means, also operated from the car, for closing said main circuit, releasing the brake and throwing the load of the car upon the motor, substantially as described.

4. The combination with an elevator and its hoisting apparatus, of a motor, a normally open auxiliary circuit connected with said motor, means, operated from the car, for closing said circuit in advance of the load of the car being put upon said motor, a main working circuit connected with said motor, and means, also operated from the car, for closing said main circuitand simultaneously releasing the brake and throwing the load of the car upon the motor, substantially as described.

5. The combination with an elevator and its hoisting apparatus, of a motor, an auxiliary circuit connected with saidmotor, an auxiliary switch controlling said circuit, a rope leading to the car and connectedwvith said switch whereby when pulled'the rope will closesai'd switch and when released the switch willvbe allowed to open, means for opening said switch when the rope is'released, a working circuit connected with the motor, and means, operated from the car, for simultaneously shifting the belt of the motor to the tight pulley of the apparatus, releasing the brake, and closing the said working circuit, substantially as described.

In testimony whereof I affix lily-signature in presence of two witnesses.

DAVID II. DARRIN.

W'itnesses:

IRA G. DARRIN, C. V. EDwARDs. 

